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HK: Fachverband Physik der Hadronen und Kerne
HK 1: Structure and Dynamics of Nuclei I
HK 1.3: Vortrag
Montag, 10. März 2025, 15:45–16:00, HS 2 Physik
Probing the doubly-magic shell closure at 132Sn by Coulomb excitation of neutron-rich 130Sn — •Maximilian Droste1, Peter Reiter2, and Thorsten Kröll2 for the IS702 collaboration — 1IKP, Universität zu Köln — 2IKP, TU Darmstadt
Excited states of 130Sn, the even-even neighbour of doubly-magic 132Sn, were studied by safe Coulomb excitation using the highly-efficient MINIBALL array. The 130Sn ions were accelerated to 4.4 MeV/u at the HIE-ISOLDE accelerator and collided with a 206Pb target. Deexciting γ rays from
excited states were detected in coincidence with scattered particles. In addition to γ rays from the first 2+ state of 130Sn, deexcitation from higher-lying states was observed, attributed to an
isomeric 130Sn Jπ = 7− beam component. A new B(E2; 0g.s.+ → 21+) value is compared to recent theoretical results from state-of-the-art MCSM calculations which differ strongly from previous measurements [1,2]. These calculations also indicate a transition from a slightly oblate to a prolate configuration of the first excited 2+ state across doubly magic 132Sn. The high statistics of the performed experiment allows for an experimental investigation of the Q2+ value.
[1] D. Rosiak et al. Phys. Rev. Lett. 121, 252501 (2018)
[2] T. Togashi et al. Phys. Rev. Lett. 121, 062501 (2018)
Supported by the German BMBF 05P21PKCI1, 05P24PKCI1, 05P21RDCI2 and European Union*s Horizon Europe Frame-
work research and innovation programme under grant agreement no. 101057511
Keywords: Nuclear structure; Coulomb excitation; Miniball; Gamma spectroscopy